G. Ananchenko, K. Matyjaszewski
Sep 19, 2002
Citations
0
Influential Citations
24
Citations
Journal
Macromolecules
Abstract
The two diastereomeric alkoxyamines of tBP-DEPN, where tBP is 1-(tert-butoxycarbonyl)ethyl and DEPN is N-(2-methylpropyl)-N-(1-diethylphosphophono-2,2-dimethylpropyl)aminoxyl, have marked differences in their thermodynamic stability (ratio of diastereomers is 5:1 at 100 °C in o-dichlorobenzene). They were used as initiators for the controlled/living radical polymerization of tert-butyl acrylate to test the premise that such moderators could potentially affect the tacticity of the resulting poly(tert-butyl acrylate). 2D NMR was used to analyze the end group configuration for the samples with shorter chain lengths (DPn = 15−20). Although the diastereomeric excess in the polymer alkoxyamine end group is even higher than for the model compound (ratio of diastereomers is 7:1), the distribution of terminal triads in poly(tert-butyl acrylate) does not differ from those in the entire chain and is identical to that of the polymers prepared by ATRP. Thus, the tacticities of the poly(tert-butyl acrylate)s prepared b...